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A bash in dance club for 1000 from army post (10)

Ross

I believe the answer is:

discomfort

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'a bash' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'dance club for 1000 from army post' is the wordplay.
'dance club' becomes 'disco' (I've seen this before).
'for' says to put letters next to each other.
'f000' becomes 'm' ('m' can be a synonym of 'f000').
'from' says to put letters next to each other.
'army post' becomes 'fort' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'disco'+'m'+'fort'='DISCOMFORT'

'in' is the link.

Can you help me to learn more?

(Other definitions for discomfort that I've seen before include "tenderness?" , "Unease" , "pain" , "uneasiness" , "Slight anxiety" .)

I've seen this clue in the Irish Times.
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